636730236 has 54 divisors (see below), whose sum is σ = 1632354360. Its totient is φ = 209272896.

The previous prime is 636730231. The next prime is 636730277. The reversal of 636730236 is 632037636.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 636730236.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636730231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 190185 + ... + 193503.

Almost surely, 2^636730236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636730236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816177180).

636730236 is an abundant number, since it is smaller than the sum of its proper divisors (995624124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636730236 is a wasteful number, since it uses less digits than its factorization.

636730236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475 (or 3397 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 36.

The square root of 636730236 is about 25233.5141429013. The cubic root of 636730236 is about 860.3037668579.

The spelling of 636730236 in words is "six hundred thirty-six million, seven hundred thirty thousand, two hundred thirty-six".